You know what it looks like… but what is it called?
TAKE THE QUIZ“master chief”
The following 3 entries include the term master chief.
master chief petty officer
noun: an enlisted man in the navy or coast guard ranking above a senior chief petty officer
master chief petty officer of the coast guard
noun phrase: the ranking petty officer in the coast guard serving as adviser to the commandant
master chief petty officer of the navy
noun phrase: the ranking petty officer in the navy serving as adviser to the chief of naval operations
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Merriam-Webster unabridged